Chalice of the Void [Kaladesh Inventions] Rivals of Ixalan or triggered ability

or triggered ability

creatures you control can't be the targets of spells or abilities your opponents control this turn

" —Alexander Pope

Set: Amonkhet Invocations Type: Enchantment Rarity: Mythic Cost: {U}{U} Whenever an opponent casts a spell

Set: Iconic Masters Type: Instant Rarity: Rare Cost: {1}{U}{U}{U} Choose two —

Chalice of the Void [Kaladesh Inventions] Rivals of Ixalan or triggered abilitySet: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {X}{X} Chalice of the Void enters the battlefield with X charge counters on it. Whenever a player casts a spell with mana value equal to the number of charge counters on Chalice of the Void, counter that spell.